Statistical analysis
Continuous data were presented as mean and standard deviation within the normal range. These data were analyzed using student’s and independent sample t -test or Mann–Whitney U test. Meanwhile, categorical variables were expressed as counts and percentages, and they were analyzed using chi-square test or Fisher’s exact test. Univariate and multivariate logistic regression analyses were conducted to determine the risk factors for SCI after MICS. A P value ≤0.05 was considered statistically significant. Statistical analysis was conducted using the Statistical Package for the Social Sciences software version 25.0 (IBM, NY).